Die head



W. w. VOSPER DIE HEAD July 6 1926.

Filed June 2 1924 amulet Patented July 6, 1926.

UNITED STATES 1,591,585" PATENT OFFICE.

WILLIAM W. VOSPER, OF TOLEDO, OHIO, ASSIGNOR TO'THE TOLEDO PIPETHREADING MACHINE COMPANY, OF TOLEDO,OHIO, A .GORPQRATION OF OHIO.

DIE HEAD.

Application filed. m 1924. Serial No. 722,905.

This invention relates to thread cutting tools, and particularly to oneof the hand type havin a plurality of thread cutting sets carried inoperative relation thereby, although it isnot restricted to use in thisconnection. i i

The object of the invention is the provision of a light and compact toolof the class described, and which hasits chaser mounted in a strong anddurable manner and capablev of being easily and quickly removed andothers substituted therefor.

The invention is fully described in the following specification, and a.preferred embodiment thereof illustrated in the accompanying drawings,in which, 1.

Figure 1 is a side elevation of a device embodying the/invention, andFig. 2 is a section thereof on the line 2-2 in Fig. 1.

Referring to the drawings, 1 designatesa die head having. threeequidistantly spaced work-receiving holes 2, 3 and 4 extendingdiametrically therethrough in intersecting relation with eachterminating at one end in an enlargement 5 concentric therewith anddisposed in a respective boss 6 provided on the respective side of thedie head. The bosses .6 are equidistantly spaced circumferentiallyaround the head and small ends of the holes 2,3 and 4, whichare disposedin opposition to the respective enlarged ends 5 thereof, terminatebetween the bosses, as.

shown. The interior of the head 1 is preferably hollowed out, as shownat 7, to provide lightness of construction and is provided at oppositesides thereof at right angles to the circumferential plane of the holes2, 3 and 4 with oppositely projecting socketed extensions 8 forreceiving handles 9 to facilitate a turning of the head about a pipe orwork piece as an axis, inserted in any one of said holes.

The outer end of each boss 6 forms an annular ring seat 10, which inwidth extends from the outer edge of the boss to near its inner edge,being spaced from the respective hole enlargement 5 by an annularshoulder or fiange'll that is concentric to said enlargement. Theportion of each boss 6, which forms the wall of its bore enlargement 5,is provided with a plurality of radial chaser receiving slots oropenings 12, four in number in the resent instance, which extendradially entirely through the wall and, in depth extend inward adistance from the outer end of the respective boss to suit the depthofthe chasers 13 disposed therein. Each chaser 13 extends from the outerend of its opening 12 to a distance within the respective openingenlargement 5 to adapt them to, have threading engagement at their innerends with their work piece projecting throughthe opening 5. A chaserclamping ring 14 is mounted on the outer end of each boss in closefitting rela tion around the shoulder 11 thereof, by which itis-retained in concentric relation to the boss center and is adapted toseat on the outer side edges of the chasers 13 ,to hold them firmly inthe openings 12 provided therefor, the chasers projecting slightly abovethe ring seat 10 to permit the ring to have a firm clamping actionthereagainst thereby to enable the ring to assist in counteracting thethrust of the chasers. Screws 15 extend through each ring 14 and threadinto the respective boss 6 for securing the ring inv chaser holdingposition. The chaser receiving slots or openings 12 are arranged in eachboss 6 at the sides of or between the openings 2, 3 and 4 on account ofthe. greater amount of stock in the bosses be tween said opening. Thisenables the bosses 6 to beef moreshallow form and the head 1 toconsequently be'of smaller diameter as the walls of the openings 2, 3and 4: can then be made thin at points between each of such openings andthe adjacent enlargements 5 of other openings as shown, as there issuflicient stock at the sides of the openings 2, 3 and 4 within therespective bosses to accommodate the depth of the chaser receiving slots12.

Each chaser 13 is of L-shape or has its inner threaded end portionprovided at its outer edge with an ear to project outwardly within thering 14, whereby the chaser is adapted to shoulder outwardly against theinner side of the ring to resist outward work-threaded pressure on thechaser. The inner work engaging ends of the chasers are backed byprojections formed on the inner wall of the respective chaser receivingopen ing 5.

It is apparent that I have provided a.

three-way thread cutting tool, which is light and compact inconstruction and is provided with a centering feature for the chaserclamping ring of each seat, which is important to the practical andefiicient operation of a tool of this character.

I wish it understod that my invention is not limited to any specificconstruction, arrangement or form of the parts as it is capable ofnumerous modifications and changes Without departing from the spirit ofthe claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A tool of the class described comprising a head having a plurality ofbosses provided with substantially equidistantly spaced intersectingwork-receiving openings disposed diametrically therethrough, one end ofeach opening being larger than the other, the

surrounding wall of the large end of each opening being provided withradially disposed chaser-receiving recesses, an L-shaped chasermounted'ineach of said recesses, and an element secured to the outer endof each boss for clamping the chasers thereto, said element beingcentered by the boss with respect to the axis thereof and a portion ofsaid chasers projecting beyond the outer surface of said head to engagesaid element which element assists in counteracting the thrust of thechasers.

2. A compact three-way tool of the class described, having a head with aboss at each of three different sides thereof, the bosses being incircumferentially spaced relation around the head and each having anannular ring seat at its outer end with an annular its other workcentering end disposed between the two other bosses adjacent thereto,chasers mounted in each boss radially thereof and disposed between theadjacent work centering ends of the openings of the other two bosses andhaving their inner edges with respect to the axis of the head disposedin a plane which intersects the said adjacent openings, a chaserclamping ring mounted 'over the ring seat of each boss in centeringengagement with the annular shoulder at the inner edge of such seat, andmeans for clamping each ring to its boss.

3. A die head having a Worlcreceiving opening therethrough and formedwith a flat annular seat at one end of the opening, an outwardlyprojecting annular flange at the inner edge of and concentric with theopening, said head having a radially disposed recess adjacent thework-receiving opening, a chaser in said recess, a clamping ring seatingover the chaser for holding the latter in place and means for securingthe ring to said head, said flange cooperating with said securing meansfor properly holding the ring in centered relation to the work-receivingopening.

4. A tool of the class described including a die head having aWork-receiving opening therethrough and formed with a flat annular seatat one end of the opening, an outwardly projecting annular flange at theinner edge of and concentric with said opening, said head havingradially disposed recesses adjacent the work-receiving opening for individually receiving chasers, said seat being adapted to receive aclamping ring which is held properly in centered relation by saidprojecting flange.

In testimony whereof, I have hereunto signed my name to thisspecification.

WILLIAM lV. VOSPER.

